Analytical evaluation of jet noise source location technique utilizing an acoustically hard baffle with aperture
[electronic resource] /
by Thomas D. Norum and Edward P. McDaid.

Description

Main Author

Norum, Thomas D.

Related Names

McDaid, Edward P. (Edward Patrick)
United States. National Aeronautics and Space Administration.
Langley Research Center.

Language(s)

English

Published

Washington, D.C. : National Aeronautics and Space Administration ; 1973.

Subjects

Acoustical materials.
Jets > Jets / Fluid dynamics > Jets / Fluid dynamics / Noise.

Summary

An analytical investigation was conducted on the experimental technique that uses shielding by an acoustically hard baffle to determine the location of noise sources in a jet. The jet exhausts through a circular hole in the baffle and the radiated acoustic power is considered to be generated by a distributed source along the jet axis. It is found that the effect of the baffle on the radiated power can be neglected only when the size of the source is on the order of a wavelength of the emitted sound or larger. Since noise sources in a jet are compact, the experimental technique is insufficient to identify these sources.

Note

Prepared at Langley Research Center.
Cover title.

Physical Description

22 p. : ill. ; 27 cm.

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